Asteroid 162173, Ryugu, was discovered on May 10, 1999 by Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team at Socorro, New Mexico. It has a period of 1 years, 108 days.

It was named for a mythical place in Japanese mythology, Ryugu (Dragon Palace), the undersea home of Ryujin, the dragon god of the sea. It is built of either crystal or red and white coral, depending on the story, and inhabited by Ryujin and other creatures of the sea. In some versions of the legend, it is a different season on each of the palace's four sides and one day inside it is equal to a century outside it. The most The inhabitants of the palace were Ryūjin's families and servants, who were denizens of the sea. In some legends, on each of the four sides of the palace it is a different season, and one day in the palace is equal to a century outside its boundaries.

The most famous legend about Ryugu is about the fisher Urashima Taro's visit to the palace, which is similar to the American legend of Rip Van Winkle; Urashima Taro, in Japanese, is a metaphor analogous to Rip Van Winkle. Urashima Taro returned to his hometown after 300 years bearing a box containing his old age. The Japanese space probe Hayabusa 2 was planned to go to the asteroid Ryugu and bring back samples of material.

Astrologically, asteroid Ryugu seems to be about out of time, left behind, relic, nostalgia; possibly, going somewhere to obtain and bring back something (possibly something valuable).

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